INFO: task hung in ppp_release

Status: auto-obsoleted due to no activity on 2024/09/12 19:28
Reported-by: syzbot+9355450b9dee5c774be5@syzkaller.appspotmail.com
First crash: 804d, last: 804d
▶ ▼ Similar bugs (8)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task hung in ppp_release (3) ppp 1 13 771d 827d 0/29 auto-obsoleted due to no activity on 2024/09/10 18:31
linux-6.1 INFO: task hung in ppp_release 1 1 798d 798d 0/3 auto-obsoleted due to no activity on 2024/09/18 07:06
upstream INFO: task hung in ppp_release (5) ppp 1 1 573d 573d 0/29 auto-obsoleted due to no activity on 2025/04/21 19:30
upstream INFO: task hung in ppp_release ppp 1 1 2270d 2270d 0/29 auto-closed as invalid on 2020/08/28 19:07
upstream INFO: task hung in ppp_release (2) ppp 1 1 1798d 1798d 0/29 auto-closed as invalid on 2021/12/13 06:07
linux-6.6 INFO: task hung in ppp_release 1 1 128d 128d 0/2 auto-obsoleted due to no activity on 2026/07/20 00:01
upstream INFO: task hung in ppp_release (4) ppp 1 22 659d 695d 0/29 auto-obsoleted due to no activity on 2024/12/16 17:48
android-49 INFO: task hung in ppp_release 1 1 2685d 2682d 0/3 auto-closed as invalid on 2019/10/08 10:46

Sample crash report:
INFO: task syz-executor.2:4638 blocked for more than 143 seconds.
      Not tainted 5.15.160-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.2  state:D stack:26624 pid: 4638 ppid:  3537 flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5030 [inline]
 __schedule+0x12c4/0x45b0 kernel/sched/core.c:6376
 schedule+0x11b/0x1f0 kernel/sched/core.c:6459
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6518
 __mutex_lock_common+0xe34/0x25a0 kernel/locking/mutex.c:669
 __mutex_lock kernel/locking/mutex.c:729 [inline]
 mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
 ppp_release+0x86/0x1f0 drivers/net/ppp/ppp_generic.c:404
 __fput+0x3bf/0x890 fs/file_table.c:280
 task_work_run+0x129/0x1a0 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0x106/0x130 kernel/entry/common.c:181
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x5d/0x240 kernel/entry/common.c:307
 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f7c4e64bdda
RSP: 002b:00007fffd3830af0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00007f7c4e64bdda
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: ffffffffffffffff R08: 00007f7c4e5d0000 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000293 R12: 00007f7c4e783f80
R13: 00007f7c4e783f8c R14: 0000000000000032 R15: 00007f7c4e785980
 </TASK>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/06/04 19:27 linux-5.15.y c61bd26ae81a 11f2afa5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: task hung in ppp_release
* Struck through repros no longer work on HEAD.